SCR Deactivation Kinetics for Model-Based Control and Accelerated Aging Applications

Bartley, Gordon; Chadwell, Christopher; Kostek, Theodore M.; Zhan, Reggie

doi:10.4271/2012-01-1077

“…(2), the rate of ammonia storage capacity loss has a first order dependence on the excess ammonia storage capacity with respect to its residual asymptotic level. This proposal is in agreement with recent studies , , in which a first order dependence of ammonia storage capacity on A.t. was found. In its integrated form, Eq.…”

Section: Resultssupporting

confidence: 93%

Modelling the Hydrothermal Ageing of a Fe‐Zeolite Catalyst for Automotive NH₃‐SCR Applications

Ruggeri

¹

,

Nova

²

,

Tronconi

³

et al. 2018

Chemie Ingenieur Technik

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The effects of duration and temperature of hydrothermal ageing treatments were investigated on a commercial Fe‐zeolite catalyst for NH3‐SCR addressing NH3 adsorption, NH3 oxidation, and NH3 reaction with NOx. Hydrothermal ageing affected primarily NH3 oxidation and standard SCR activities, as well as NH3 storage capacity. Deactivation was fast in the first few hours, eventually approaching asymptotic levels. There is potential to predict the effects of hydrothermal ageing on the SCR behavior of Fe‐zeolite catalysts as a function of just one parameter, i.e., the NH3 storage capacity.

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“…Bartley, et al [47] describes NH 3 storage capacity as a function of SCR catalyst aging time and temperature. The researchers modeled the aging using first-principle Langmuir adsorption isotherms.…”

Section: Figure 8 Generational Improvements In Cu-zeolite Scr Catalymentioning

confidence: 99%

“…A Honda approach is three-fold [47,50]. As described in the LD diesel engine section, the first approach is to minimize NOx going to the SCR under HL transient conditions by running the engine at stoichiometry and allowing the DOC to remove much of the NOx.…”

Section: Figure 9 Layout Of a New Ld Scr System Incorporating Two Scmentioning

confidence: 99%

Vehicular Emissions in Review

Johnson¹

2013

SAE Int. J. Engines

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This review paper summarizes major developments in vehicular emissions regulations and technologies (light-duty, heavy-duty, gasoline, diesel) in 2012. First, the paper covers the key regulatory developments in the field, including finalized criteria pollutant tightening in California; and in Europe, the development of real-world driving emissions (RDE) standards. The US finalized LD (light-duty) greenhouse gas (GHG) regulation for 2017-25. The paper then gives a brief, high-level overview of key developments in LD and HD engine technology, covering both gasoline and diesel. Marked improvements in engine efficiency are summarized for gasoline and diesel engines to meet both the emerging NOx and GHG regulations. HD engines are just starting to demonstrate 50% brake thermal efficiency. NOx control technologies are then summarized, including SCR (selective catalytic reduction) with ammonia, and hydrocarbon-based approaches. Emphasis is on low-temperature deNOx, durability, and cost reduction. PM (particulate matter) reduction technologies are evolving around SCR integration and the behavior of soot and ash deposits. Next, DOC (diesel oxidation catalyst) developments are summarized. They mainly involve better understanding of aging and substitution of base metals oxides for precious metal. The paper then discusses some key developments in gasoline emission controls, focusing on new coated GPF (gasoline particulate filter) understanding. Advanced three-way catalysts improve with layered coating technology, and with improved understanding on engine calibration.

show abstract

“…SCR catalyst systems will age, and this impacts NH 3 capacity. Bartley, et al [47] describes NH 3 storage capacity as a function of SCR catalyst aging time and temperature. The researchers modeled the aging using first-principle Langmuir adsorption isotherms.…”

Section: Figure 8 Generational Improvements In Cu-zeolite Scr Catalymentioning

confidence: 99%

Vehicular Emissions in Review

Johnson¹

2012

SAE Int. J. Engines

View full text Add to dashboard Cite

This review paper summarizes major developments in vehicular emissions regulations and technologies (light-duty, heavy-duty, gasoline, diesel) in 2012. First, the paper covers the key regulatory developments in the field, including finalized criteria pollutant tightening in California; and in Europe, the development of real-world driving emissions (RDE) standards. The US finalized LD (light-duty) greenhouse gas (GHG) regulation for 2017-25. The paper then gives a brief, high-level overview of key developments in LD and HD engine technology, covering both gasoline and diesel. Marked improvements in engine efficiency are summarized for gasoline and diesel engines to meet both the emerging NOx and GHG regulations. HD engines are just starting to demonstrate 50% brake thermal efficiency. NOx control technologies are then summarized, including SCR (selective catalytic reduction) with ammonia, and hydrocarbon-based approaches. Emphasis is on low-temperature deNOx, durability, and cost reduction. PM (particulate matter) reduction technologies are evolving around SCR integration and the behavior of soot and ash deposits. Next, DOC (diesel oxidation catalyst) developments are summarized. They mainly involve better understanding of aging and substitution of base metals oxides for precious metal. The paper then discusses some key developments in gasoline emission controls, focusing on new coated GPF (gasoline particulate filter) understanding. Advanced three-way catalysts improve with layered coating technology, and with improved understanding on engine calibration.

show abstract

SCR Deactivation Kinetics for Model-Based Control and Accelerated Aging Applications

Cited by 18 publications

References 2 publications

Modelling the Hydrothermal Ageing of a Fe‐Zeolite Catalyst for Automotive NH₃‐SCR Applications

Modelling the Hydrothermal Ageing of a Fe‐Zeolite Catalyst for Automotive NH₃‐SCR Applications

Vehicular Emissions in Review

Vehicular Emissions in Review

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SCR Deactivation Kinetics for Model-Based Control and Accelerated Aging Applications

Cited by 18 publications

References 2 publications

Modelling the Hydrothermal Ageing of a Fe‐Zeolite Catalyst for Automotive NH3‐SCR Applications

Modelling the Hydrothermal Ageing of a Fe‐Zeolite Catalyst for Automotive NH3‐SCR Applications

Vehicular Emissions in Review

Vehicular Emissions in Review

Contact Info

Product

Resources

About

Modelling the Hydrothermal Ageing of a Fe‐Zeolite Catalyst for Automotive NH₃‐SCR Applications

Modelling the Hydrothermal Ageing of a Fe‐Zeolite Catalyst for Automotive NH₃‐SCR Applications